/* Always have wp_head() just before the closing </head>
* tag of your theme, or you will break many plugins, which
* generally use this hook to add elements to <head> such
* as styles, scripts, and meta tags.
*/
wp_head();
?>
</head>

That’s helped me, thanks fedmich. I’ve made a child theme of twentyten and would like to exclude some pages from the main nav bar. The css works, but is there a way with php? With twentyten the wp_list_pages (‘exclude=5’ ) doesn’t seem possible! I’ve looked in the header and functions but can’t work out a way to do it. Does anybody have any ideas?